DE102011101906B4 - Injection molding machine with resin supply amount adjusting agent - Google Patents

Abstract

An injection molding machine comprising an injection cylinder, a screw rotatably and retractably disposed within the injection cylinder, screw rotational driving means for rotationally driving the screw, screw rotation amount detecting means for detecting a screw rotation amount in a predetermined range, and resin material supply means for supplying resin material into the injection cylinder, the injection molding machine further Resin supply amount setting means for setting a resin supply amount of the resin material supply means such that the resin supply amount is increased when the screw rotation amount detected by the screw rotation amount detection means is larger than a predetermined target value, whereas the resin supply amount is decreased when the screw rotation amount detected by the screw rotation amount detection means is smaller is as the predetermined target value, so that the screw rotation amount detected by the screw rotation amount detecting means corresponds to the predetermined target value.

Description

Background of the invention

1. Field of the invention

The present invention relates to an injection molding machine, and more particularly, to an injection molding machine having a resin supply amount adjusting means.

2. Description of the Related Art

In general, granules serving as casting material are supplied to an injection cylinder of an injection molding machine by storing the granules in a feed hopper installed on the injection cylinder and feeding the granules under gravity to the injection cylinder. In this case, the plastic or resin supply port of the injection cylinder is filled with granules. This condition will be referred to as "full supply" hereinafter.

In contrast, the so-called "ration feed" is known, in which the granules are supplied in small portions, so that the plastic or resin supply port of the injection cylinder is in a sparsely or partially filled state. For example, Japanese Patent Application Laid-Open Publication No. Hei. JP 5-318531A the configuration in which a granule feeder is provided between a granule supply source and an injection cylinder and the granule feed rate is controlled by increasing or decreasing the feed rate of the granule feeder.

When the ration supply is performed, the following positive effects are obtained: the removal of gas generated inside the injection cylinder from the resin supply port is improved, and abnormal friction on the inner wall of the injection cylinder caused by friction between the resin material and the inner wall of the injection cylinder is prevented the proximity of the resin feed port is conditional. However, when the sparse state (ration state) of the resin material in the resin supply port changes, the plasticizing ability of the resin in the dosing operation and the casting quality may be adversely affected. The resulting problem is that the material supply should be performed so as to ensure a constant state of ration when the ration feed is performed.

Japanese Patent Application Laid-open No. JP 2002-248655 A describes a configuration, the casting material detecting means for detecting the casting material within a screw groove, in which the supply amount of the resin material is controlled in accordance with the detection result of the Gießmaterialerfassungsmittels such that the amount of the casting material in the screw groove does not reach 100% , The problem associated with such a configuration, however, is that special means are necessary for gripping the casting material in the screw groove.

Japanese Patent Application Laid-open No. JP 53-11957A describes a feature of detecting a torque of a screw rotation in the metering operation and adjusting the supply amount of raw resin such that the detected torque coincides with a reference value. However, in some types of resin materials, the screw torque does not change even if the ration state changes. The resulting problem is that the ration state in such cases can not be controlled based on the screw torque.

Japanese Patent Application Laid-open No. JP 1-171 830 A describes a feature of determining the difference between the current metering time during the plasticizing operation and the predetermined reference metering time, and controlling the material supply amount by the material supply apparatus based on the determination result. However, the ration state can not be determined exactly because the dosing time changes depending on the value of the screw rotation speed.

Japanese Patent Application Laid-open No. JP 3-114 813 A discloses a raw resin supply device in which a resin passage is intermittently opened and closed, and the raw resin is intermittently supplied to the supply unit when a color change operation is performed by using a crude resin which is a color-change object. In this apparatus, the set time or the total number of revolutions of the screw is set as a determination criterion for determining the supply start timing of the color-change resin.

Japanese Patent Application Laid-open No. JP 3-118 132 A describes an injection molding apparatus in which the monitoring is performed by determining on the basis of dosing information from sensors provided in different units of the injection molding machine, whether or not any dosing data corresponding to each predetermined monitoring object is within the permitted range. In this injection molding machine, the screw or screw rotation amount is calculated integrally from a rotation start timing of the screw and the calculated screw or screw rotation amount is used as one of the monitoring objects during a loading dosing operation.

Japanese Patent Application Laid-open No. JP 05-077 295 A describes an injection molding machine with a radially projecting on an output axis part. A sensor detects the passage of the protruding part by following a rotation on the axis. A rotation detector comprising the sensor and the protruding part detects the rotation of a screw to measure the total number of rotations of the screw.

The German patent application DE 44 29 708 A1 describes a spraying method wherein material is forcibly introduced into an injection cylinder by means of a feed screw. The speed of the feed screw is adjusted in response to the torque required to rotate the injection screw.

Summary of the invention

The object of the present invention is to solve the problems described above and to provide an injection molding machine which does not require special means for detecting a casting material within a screw groove and in which the supply of material can be carried out so that a constant ration state regardless of Resin or plastic material type or the value of the screw or screw rotational speed is maintained during dosing.

The first aspect of the present invention resides in an injection molding machine including an injection cylinder, a screw rotatably and retractably disposed within the injection cylinder, screw driving means for rotationally driving the screw, screw rotation amount Detection means for detecting a screw rotation amount in a predetermined range, and resin material supply means for supplying a resin material into the injection cylinder, respectively. The injection molding machine further includes resin supply amount setting means for setting a resin supply amount of the resin material supply means such that the amount detected by the screw rotation amount detecting means detected screw or Schneckendrehbetrag corresponds to a predetermined target value.

The injection molding machine may further include target value setting means for setting a value obtained by multiplying the screw rotation amount detected by the screw rotation amount detecting means during the pouring into a full feed mode by a predetermined ration factor as the predetermined target value.

The predetermined range may be a range from a dosing start to a dosing end or may be any of a plurality of ranges obtained by further dividing a range from a dosing start to a dosing end.

The second aspect of the present invention resides in an injection molding machine including an injection cylinder, a screw rotatably and retractably disposed inside the injection cylinder, screw driving means for rotationally driving the screw, screw rotation amount Detecting means for detecting a screw rotation amount in a predetermined range, screw retreat amount detecting means for detecting a screw retreating amount within a predetermined range, and resin material supply means for supplying a resin or resin Synthetic resin or plastic material in the injection cylinder. The injection molding machine further includes resin supply amount setting means for setting a resin supply amount of the resin material supply means by dividing the flow rate by the screw rate. The amount of screw rotation detected by the amount of screw rotation detected by the screw retraction amount detecting means corresponds to a predetermined target value.

The injection molding machine may further include target value setting means for setting a value other than the predetermined target value by multiplying a value obtained by dividing the screw rotation amount detected by the screw rotation amount detecting means during the pouring in a full feed mode by the screw rotation amount Screw retraction amount detecting means detected screw or Schneckenrückziehbetrag is obtained with a predetermined Rationsfaktor.

The aforementioned predetermined range may range from a dosing start to a dosing start Or may be any of a variety of ranges obtained by further subdividing a range from a dosing start to a dosing end.

The present invention can provide an injection molding machine which does not require special means for detecting a molding material within a screw groove, and in which the supply of material can be performed so that regardless of the type of resin or the value of the Screw or screw rotational speed is maintained during dosing a constant Rationszustand.

Brief description of the drawings

1 Fig. 10 is a cross-sectional view of a main part of an injection molding machine having a resin supply quantity adjusting unit according to the present invention and a block diagram illustrating a control for the injection molding machine.

2 FIG. 10 is a flowchart illustrating a process control algorithm in which the resin supply adjustment according to the present invention is performed based on a screw rotation amount during dosing.

3 FIG. 10 is a flowchart illustrating a process control algorithm in which the resin supply amount adjustment according to the present invention is performed based on a ratio of the screw rotation amount to the metering stroke during dosing.

4A and 4B 13 are flowcharts illustrating a flow control algorithm in which the resin supply adjustment according to the present invention is performed based on a screw rotation amount during dosing, which flow control controls the setting of a target value of screwing. or screw rotation amount.

5 FIG. 10 is a flowchart illustrating a flow control algorithm in which the resin supply amount adjustment according to the present invention is performed based on a screw rotation amount in any one of a plurality of regions into which a region of the Dosierbeginn has been divided to the dosing.

Description of the Preferred Embodiments

When the ration feed is performed and the material density decreases, the plasticization rate of the resin decreases per revolution of the screw in the metering operation. In other words, the screw or screw rotation amount necessary for metering a predetermined amount of resin increases over the full-feed mode. The present invention is based on this feature and ensures optimum control of the supply amount of the resin material based on the screw rotation amount during dosing. Thus, the supply of material is performed to maintain a constant state of ration by detecting the screw rotation amount during dosing and controlling the supply amount of the resin material such that the detected screw rotation amount is a predetermined value matches.

1 Fig. 10 is a cross-sectional view of a main part of an injection molding machine having a resin supply quantity adjusting unit according to the present invention and a block diagram illustrating a control for the injection molding machine.

An injection screw or screw 1 the injection molding machine is slidable and rotatable in an injection cylinder 2 and an axial injection process and the rotation of the screw about the axis are independently performed by an injection servomotor M1 and a screw rotation servomotor M2. The reference number 31 denotes a power transmission mechanism which uses the injection servomotor M1 as a driving source and causes the injection screw 1 performs an injection process. The reference number 32 denotes a power transmission mechanism which uses the screw rotational servo motor M2 as a driving source and causes the injection screw to perform a dosing operation. The injection cylinder 2 is also provided with a heating unit (not shown in the figure) formed by a heating tape or the like.

A funnel 4 for filling granules serving as a casting material is at the top of a base part of the injection cylinder 2 arranged and a Granulatzuführer 5 for feeding the in the funnel 4 Granules in the injection cylinder 2 is between the funnel 4 , which is the granule feed source, and the injection cylinder 2 intended. The granule feeder 5 is through a rotor provided with blades 7 which is arranged to be one between the funnel 4 and the injection cylinder 2 formed transmission path 6 to cross, a motor M3, which is a rotary drive means for the rotor with blades 7 is, and a motor drive circuit 8th formed, which controls the rotational speed of the motor M3. The transmission speed of the granules coming out of the funnel 4 the injection cylinder 2 is supplied by controlling the rotational speed of the blade rotor 7 is set based on the resin supply amount command value F.

A special metering screw and a peripheral configuration thereof may be used instead of the blade rotor 7 , the main part of the granulator 5 The granules can be used by rotating the special screw or screw with the motor M3 to the injection cylinder 2 be supplied. Rotary encoders P1 and P2 are respectively attached to the injection servomotor M1 and the screw rotational servomotor M2, and the current position (axial position) and rotational position (about the axis) of the injection screw 1 can be detected.

A controller 100 the injection molding machine includes a microprocessor 111 for numerical control (hereinafter referred to as CNC-CPU) and a microprocessor 113 for a programmable machine control (hereinafter referred to as PMC CPU). A ROM 116 , which is a sequence program for controlling a draining operation of the injection molding machine or the granule feeder 5 saves, a non-volatile PMC RAM 109 and a ram 108 to save current positions are with the PMC CPU 113 connected. The CNC CPU 111 serves to control all the components of the injection molding machine. Servo circuits for drive control of the servo motors of all axes for a holder (not shown in the figure), for an ejector (not shown in the figure), for the screw or screw rotation and for injecting are via a servo interface 110 connected. Only one servo circuit 102 for the injection servomotor M1 and servo circuit 101 for the screw or screw rotary servomotor M2 are in 1 shown.

The reference number 104 denotes a non-volatile common RAM including a storage unit that stores an NC program for controlling various operations of the injection molding machine, and a setting storage unit that stores various settings, parameters, and macro variables. Different casting conditions and dosing conditions by an operator via a manual data input device 117 can be set and input, which is equipped with an LCD screen device, and a control panel control 115 are stored in the setting memory unit in the common RAM. The reference number 112 denotes a Busarbitersteuerung (hereinafter referred to as BAS). Buses of the CNC CPU 111 , the PMC CPU 113 , the common RAM 104 , the input circuit 105 and the output circuit 106 are with the BAS 112 connected and from the BAS 112 used buses are controlled.

The injection servomotor M1 is connected to the servo circuit 102 connected and a detection output of the encoder P1 is in the servo circuit 102 entered. The current (axial) position of the injection screw or worm 1 is detected at all times by an actual position memory register, which is in the servo interface 110 is arranged. Further, the screw rotational servo motor M2 is connected to the servo circuit 101 connected, a detection output of the encoder P2 is in the servo circuit 101 entered and the position and speed control is performed. A RAM 103 is an operating data memory for the CNC CPU 111 ,

A motor drive circuit 8th is via a digital-to-analog converter nine with the output circuit 106 the control device 100 connected. The motor drive circuit 8th controls the drive of the motor M3 by a speed command from the controller 100 by the digital-to-analog converter nine digital-to-analog has been converted, and the bladed rotor 7 of the granulator feeder 5 Do this in the funnel 4 Granules located in the injection cylinder 2 at a feed rate equal to the speed command of the controller 100 equivalent.

In the configuration described above, the CNC CPU distributes 111 Pulses to the servo circuits of the various axes of the injection molding machine via the servo interface 110 and performs the drive control of the injection molding machine in accordance with the in the CNC ROM 114 stored NC program or in accordance with the common RAM 104 stored casting conditions and one in the PMC ROM 116 stored sequence program while the PMC CPU 113 performs the sequence control. As far as the injection molding machine itself is concerned, the drive control system of the various units is completely comparable to a conventional control system.

Thus, the injection servomotor M1 in the metering / kneading operation becomes conventional drive-based based on a back pressure, previously in the common RAM 104 has been set, and the CNC CPU 111 , which is a dosing start signal from the PMC CPU 113 has received, begins with the pulse distribution via the servo interface 110 for each predetermined period of time in accordance with the screw rotating speed previously set in the common RAM 104 has been established. Then the servo circuit performs 101 comprising an error register, an F / V converter and an error amplifier or a power amplifier, the processing of the position, the speed and the circuit based on the distribution pulses of the CNC CPU 111 and feedback pulses of the rotary encoder P2, outputs a torque command, and controls the screw-type rotary servo motor M2 so that the rotational speed of the injection screw becomes equal to the set speed.

The above-described injection molding machine and its control are provided with the functions described below to control the flow according to the flowchart in FIG 2 to 5 to execute the algorithm shown.

<Initial value of the resin supply amount command value F>

The output value of the supply amount command value F set when the operation is started may be an eigenvalue corresponding to the specification such as the diameter of the injection screw 1 , or may be a value indicating the supply of resin amount corresponding to the volume of a molded article. The output value of the supply amount command value F may be previously in the common RAM 104 stored, which serves as a non-volatile memory.

<Screw rotation amount detecting unit>

A screw rotation amount detection unit is for detecting and storing the screw rotation amount of the injection screw 1 , For example, the screw or worm rotation axis is provided with the rotary encoder P2 and values of the rotary encoder P2 are detected and stored when the dosing operation starts and ends. The values of the rotary encoder P2 which are detected when the dosing starts and ends are, for example, in the RAM 103 saved. The difference between two values that have been sensed and stored is then determined, and this difference between two values is considered to be a screw or skew amount during dosing in the RAM 103 saved. Alternatively, the screw rotation amount detection unit may be provided with a rotation speed detector on the screw rotation axis, and may determine the time integrated value of the screw rotation speed from the start to the end of the metering operation.

<Calculation of the resin supply amount command value F>

Where the supply amount command value F is calculated when the detected screw rotation amount is smaller than a predetermined target value, the ration state is dense (in other words, the full state is realized), and therefore the adjustment is made to set the supply amount command value F to reduce. On the other hand, when the detected screw rotation amount is greater than the predetermined target value, the ration state is sparse, and therefore the adjustment can be made to increase the supply amount command value F.

Alternatively, a proportional integral differential control may be performed based on a difference between the screw rotation amount detected by the screw rotation amount detecting unit and a predetermined target value, and a supply amount command value may be calculated.

Alternatively, the ration state is dense (in other words, a full state is realized) in the case where the value obtained by dividing the detected screw or screw rotation amount by the detected screw retraction amount (described below) is smaller than the predetermined one target value. Therefore, the adjustment is made to decrease the supply amount command value F. In contrast, the state of fermentation is short in the case that the value obtained by dividing the detected screw or screw rotation amount by the detected screw or screw retreat amount is larger than the predetermined target value. Therefore, the adjustment can be made to increase the supply amount command value F.

Alternatively, the supply amount command value F may be calculated by performing the proportional integral derivative control based on a difference between a value obtained by dividing the detected screw rotation amount by the detected screw retraction amount and the predetermined target value.

<Resin or plastic supply quantity setting unit>

The resin supply amount setting unit may set the supply amount of the resin material per molding cycle based on the calculated supply amount command value F. For example, the amount of rotation of one feed screw per casting cycle may be controlled, with the amount of rotation of the bladed rotor 7 of the granulator feeder 5 and the resin material supply unit for supplying the resin material by using the feed screw, as disclosed in Japanese Patent Application Laid-open No. Hei. JP 6-304 967 A , is used. Alternatively, the rotation time of the feed screw or worm per casting cycle can be controlled.

Alternatively, the resin supply amount setting unit may set the supply amount of the resin material per unit time based on the calculated supply amount command value F. For example, the amount of rotation of a feed screw during the resin feed may be controlled, with the amount of rotation of the bladed rotor 7 of the granulator feeder 5 and the resin supply unit for supplying the resin material by using the feed screw as disclosed in Japanese Patent Application Laid-Open No. JP 6-304 967 A , is used. In this case, the feed screw may be rotated from the metering operation start timing to the end timing, or may be rotated from the start timing to the end timing of the pouring cycle.

<Screw retraction amount detection unit>

A screw position detecting unit (for example, a rotary encoder P1 attached to the injection servomotor M1 and an actual axial position of the injection screw) 1 detected) for detecting the position in the screw forward-backward feed direction is used as the screw retraction amount detecting unit, and the values of the screw positions at the metering start and end timing are detected and stored. The difference between the two sensed stored values is determined and taken as a screw retraction amount during dosing. Alternatively, a screw forward-backward feed speed detecting unit may be provided for detecting the speed of screw feed in the front-rear direction, and a time integral value of the screw-forward / backward feed may be provided. Feed rate from the dosing start to the end detected by the speed detection unit can be determined.

<Value obtained by dividing the screw or worm rotation amount by the screw or worm pull-back distance>

As described above, the control may be performed to obtain a constant ration state by performing the control such that the screw rotation amount becomes equal to the set target value during the dosing. However, target values that are different depending on the dosing volume should be set as the aforementioned target value to obtain the adequate ration state. For this reason, the target value of the screw rotation amount necessary to obtain an adequate ration state corresponding to the volume of the molded article should be readjusted when the article to be molded is changed by changing the nozzle. For example, the target value needed to obtain the adequate ration state should be set as an approximately doubled value when the nozzle is changed and the cast article volume is doubled. This process can burden the operator.

Accordingly, the control may be performed to maintain a constant ration state based on a value obtained by dividing the screw rotation amount during dosing by the screw retraction amount (screw retraction distance). In this case, the value obtained by dividing the screw or screw rotation amount during dosing by the screw retraction amount practically does not change, even if the article to be molded is changed by changing the nozzle because both the screw and the screw are changed. or screw rotation amount during dosing and the screw retraction amount change in approximately the same ratio with respect to the molded article volume. Therefore, the process of readjusting the target value becomes unnecessary and a burden on the operator can be reduced.

<Setting the target value>

As described above, by performing the control such that the screw rotation amount during of dosing equal to the set target value will be controlled at a constant level. However, the target value required to obtain the adequate state of ration should be set in consideration of a standard plasticization rate, which depends on properties of the resin and the helical shape. An optimal target value is difficult to set. Accordingly, it is possible once to perform the pouring based on a full supply before formation of the ration state, to detect the screw or screw turning amount during the full-state casting with the screw rotation amount detecting unit, and to multiply by detecting the detected screw Set screw with the given Rationskoeffizienten value determined as the predetermined target value. In this case, it is not necessary to perform the setting in consideration of the standard plasticization rate, which depends on properties of the resin and the screw shape, and a burden on the operator can be reduced because the determination is made by the screw or screw rotation amount is taken as a reference during casting in the full state, and a value obtained by multiplying the reference screw screw rotation amount by the predetermined ration coefficient is used as a target value.

According to the present invention, the ration coefficient is a value corresponding to the density of the ration state determined with reference to the value in a full feed mode, and a ratio of the screw rotation amount during the ration feed to the screw rotation amount during the Full feed as reference means. In other words, the ration coefficient means a value obtained by dividing the screw rotation amount during the ration supply by the screw rotation amount during the full supply. The predetermined ration coefficient does not depend on the standard plasticization rate, which depends on properties of the resin and a screw shape, and a value corresponding to the density of the state of ration to be formed can be set. Therefore, the setting process is simplified. Typically, a stable dosage can be accomplished by setting a cationic coefficient of about 1.1 to 1.2. The ration coefficient of 1.1 to 1.2 means that the resin supply amount is reduced such that the screw rotation amount increases by a factor of 1.1 to 1.2 with respect to the value during the Full intake is increased. The predetermined ration coefficient may be set by an operator, or an initial value of about 1.1 to 1.2 may be set in advance in the resin supply amount setting unit.

2 FIG. 10 is a flowchart illustrating a process control algorithm in which the resin supply adjustment according to the present invention is performed based on a screw rotation amount during dosing. The explanation is based on the steps below. When the process begins, the injection cylinder is manually filled with the resin or plastic.

Step SA100: The output value of the supply amount command value F is set.

Step SA101: The injection / reprinting operation is performed.

Step SA102: The dosage starts.

Step SA103: Based on the feed amount command value F calculated in the preceding cycle, the resin is supplied. Based on the initial value of the supply amount command value F set in the first pouring cycle in step SA100, the resin is supplied.

Step SA104: The screw or screw encoder value C1 for dosing start is detected and stored.

Step SA105: It is determined whether or not the dosing has been completed, and the program proceeds to step SA106 when dosing has been completed.

Step SA106: The screw or worm encoder value C2 to the dosing end is detected and stored.

Step SA107: The screw rotation amount ΔC (= C2-C1) during dosing is calculated from the encoder value C1 detected in step SA104 and the encoder value C2 detected in step SA106.

Step SA108: The resin supply amount command value F is calculated so that the screw rotation amount ΔC during the dosing calculated in step SA107 coincides with the target value.

Step SA109: It is determined whether the operation has been completed or not, and if the operation has not been completed, the program returns to Step SA101 returns and the flow control is continued. If the process has ended, the process control is ended.

3 FIG. 10 is a flowchart illustrating a processing algorithm in which the resin supply amount adjustment according to the present invention is performed based on a ratio of the screw rotation amount to the metering stroke during dosing. The explanation is based on the steps below. When the process begins, the injection cylinder is manually filled with the resin or plastic.

Step SB100: The output value of the supply amount command value F is set.

Step SB101: The injection / reprinting operation is performed.

Step SB102: The dosage starts.

Step SB103: Based on the feed amount command value F calculated in the preceding cycle, the resin is supplied. In the first molding cycle, the resin is supplied based on the initial value of the supply amount command value F set in step SB100.

Step SB104: The screw or screw encoder value C1 for dosing start is detected and stored.

Step SB105: The screw position X1 for dosing start is detected and stored.

Step SB106: It is determined whether or not the dosing has been completed, and the program proceeds to step SB107 when dosing has been completed.

Step SB107: The screw or worm encoder value C2 to the dosing end is detected and stored.

Step SB108: The screw position X2 to the dosing end is detected and stored.

Step SB109: The screw rotation amount ΔC (= C2-C1) is determined from the encoder value C1 detected in step SB104 and the encoder value C2 detected in step SB107, a screw retraction amount (X2-X1) is selected from the And a ratio of the amount of screw rotation to the screw retraction amount (= ΔC / ΔX) during dosing is determined by calculation certainly: ΔC / ΔX = (C2-C1) / (X2-X1).

Step SB110: The resin supply amount command value F is calculated such that the ratio of the screw rotation amount to the screw retraction amount (= ΔC / ΔX) during the dosing performed in step SB109 has been determined to match the target value.

Step SB111: It is determined whether or not the operation has been completed, and if the operation has not been completed, the program returns to step SB101, and the processing is continued. If the process has ended, the process control is ended.

4A and 4B 13 are flowcharts illustrating a flow control algorithm in which the resin supply amount adjustment according to the present invention is performed based on a screw rotation amount during dosing, which flow control controls the setting of a target value of the screw torque. or screw rotation amount. The explanation is based on the steps below. When the process begins, the injection cylinder is manually filled with the resin or plastic.

Step SC100: The resin material is supplied so that the resin becomes a dense state (full state).

Step SC101: The injection / reprinting operation is performed.

Step SC102: The dosage starts.

Step SC103: The screw or worm encoder value C'1 at the start of dosing is detected and stored.

Step SC104: It is determined whether or not the dosing has been completed, and the program proceeds to step SC105 when dosing has been completed.

Step SC105: The screw or worm encoder value C'2 to the dosing end is detected and stored.

Step SC106: The screw amount ΔC '(= C'2-C'1) during dosing is calculated.

Step SC107: The target value S is calculated and set as S = K · ΔC '. Here K is a ration coefficient.

Step SC108: The output value of the supply amount command value F is set.

Step SC109: The injection / reprinting operation is carried out.

Step SC110: The dosage starts.

Step SC111: Based on the feed amount command value F calculated in the previous cycle, the resin is supplied. The output value of the supply amount command value F set in step SC108 is used in the first pouring cycle.

Step SC112: The screw or screw encoder value C1 for dosing start is detected and stored.

Step SC113: It is determined whether or not the dosing has been completed, and if the dosing has been finished, the program proceeds to step SC114.

Step SC114: The screw or screw encoder value C2 to the dosing end is detected and stored.

Step SC115: The screw rotation amount ΔC (= C2-C1) during dosing is calculated.

Step SC116: The resin supply amount command value F is calculated such that the screw rotation amount ΔC coincides with the target value S during dosing.

Step SC117: It is determined whether or not the operation has been completed, and if the operation has not been completed, the program returns to step SC109, and the processing is continued. When the process has ended, the flow control is ended.

5 Fig. 10 illustrates a process control algorithm in which the resin supply amount adjustment according to the present invention is based on a screw rotation amount in any one of a plurality of regions into which a range from the dosing start to the dosing end has been divided , is carried out. The explanation is based on the steps below. When the process begins, the injection cylinder is manually filled with the resin or plastic.

Step SD100: The output value of the supply amount command value F is determined.

Step SD101: The injection / reprinting operation is performed.

Step SD102: The dosage starts.

Step SD103: Based on the feed amount command value F calculated in the foregoing range, the resin is supplied. In the first area, the resin is supplied based on the supply amount command value F set in step SD100.

Step SD104: The screw or worm encoder value C3 at the range start is detected and stored.

Step SD105: The screw position X3 at the beginning of the range is detected and stored.

Step SD106: The current screw position Xn is detected and stored.

Step SD107: It is determined whether the difference between the current screw position Xn and the screw position X3 at the range start is larger than a predetermined pull-back amount, and the flow of the control flow advances to the step SD108, if larger, the program returns to step SD106 if it is not larger.

Step SD108: The screw-shaft encoder value C4 to the range end is detected and stored.

Step SD109: From the encoder value C3 detected in step SD104 and the encoder value C4 detected in step SD108, the screw rotation amount ΔC (= C4-C3) during the dosing in the range is calculated.

Step SD110: The resin supply amount command value F is calculated such that the screw rotation amount ΔC coincides with a target value during dosing in the range calculated in step SD104.

Step SD111: It is determined whether or not the dosing has been completed, and if the dosing within the range has not been completed, the program returns to step SD103. If the dosing has been completed, the program proceeds to step SD112.

Step SD112: It is determined whether the operation has been completed or not, and if the operation has not been finished, the program returns to step SD101 and the processing is continued. If the process has ended, the process control is ended.

Claims (6)

An injection molding machine comprising an injection cylinder, a screw rotatably and retractably disposed within the injection cylinder, screw rotational driving means for rotationally driving the screw, screw rotation amount detecting means for detecting a screw rotation amount in a predetermined range, and resin material supply means for supplying resin material into the injection cylinder, the injection molding machine further Resin supply amount setting means for setting a resin supply amount of the resin material supply means such that the resin supply amount is increased when the screw rotation amount detected by the screw rotation amount detection means is larger than a predetermined target value, whereas the resin supply amount is decreased when the screw rotation amount detected by the screw rotation amount detection means is smaller is as the predetermined target value, so that the screw rotation amount detected by the screw rotation amount detecting means corresponds to the predetermined target value. An injection molding machine comprising an injection cylinder, a screw rotatably and retractably disposed inside the injection cylinder, screw rotational driving means for rotationally driving the screw, screw rotation amount detecting means for detecting a screw rotation amount within a predetermined range, screw withdrawal amount detecting means for detecting a screw retraction amount within a predetermined range, and resin material supply means for supplying a resin material into the injection cylinder, the injection molding machine further comprising resin supply amount setting means for setting a resin supply amount of the resin material supply means such that a value obtained by dividing the screw rotation amount detected by the screw rotation amount detection means by the screw insertion amount detected by the screw pull-in amount detection means becomes a predetermined target value equivalent. An injection molding machine according to claim 1, further comprising target value setting means for setting a value as the predetermined target value obtained by multiplying the screw rotation amount detected by the screw rotation amount detecting means during the pouring in a full feed mode by a predetermined ration factor. The injection molding machine according to claim 2, further comprising target value setting means for setting a value as the predetermined target value obtained by multiplying a value obtained by dividing the screw rotation amount detected by the screw rotation amount detecting means during the pouring in a full feed mode by the screw retraction amount detected by the screw retraction amount detecting means is obtained with a given ration factor. An injection molding machine according to any one of claims 1 to 4, wherein the predetermined range is a range from a dosing start to a dosing end. An injection molding machine according to any one of claims 1 to 4, wherein the predetermined area is any one of a plurality of areas obtained by further dividing a range from a dosing start to a dosing end.

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